User's Manual

DRAFT TrimTrac 1.5 Technical Manual v0.3ab 48
AND BEGIN TRANSMITTING NOMINALLY EVERY 2-3 MINUTES
UNTIL AN ACKNOWLEDGEMENT IS RECEIVED.
Verify Checksums when Analyzing Data
An easy way to analyze data received from The TrimTrac 1.5 is to log the actual
messages into a text file and verify that the messages are valid by checking the
checksums. Available from www.trimtrac.com is a simple checksum checker
executable that can be run against a text file containing messages sent from a
TrimTrac 1.5. If the checksum contained in the message is “Bad” then the
program will indicate it as “BAD” and return what the correct checksum should
have been. Verifying checksums helps avoid wasted time spent evaluating invalid
messages.
Out of Sequence Messages
Regardless of which protocol (SMS, TCP/IP or UDP) is being used, messages
received by the server application may be received out of sequence. If Automatic
Message Log Dump is enabled, and the device left and re-entered GSM coverage,
then the device will transmit messages logged while outside of GSM coverage
after GSM has been re-established. In so doing, messages will be received by the
server application out of sequence. When using UDP or SMS, there is no
guarantee that messages will be received in the same order transmitted by the
TrimTrac 1.5.
Updating Firmware in the Field
You can upload new firmware from a PC or laptop connected to the Provisioning
Module. For more information on updating firmware in the field, please consult
with your Trimble technical support representative.
LED Indicator
The LED indicator is useful for diagnosing problems. For more information, see
LED States, page 103. If you detect a problem, then have the TrimTrac 1.5
inspected by qualified service personnel.
Responding to Query or Set Data Messages
The TrimTrac 1.5 processes and, except as noted below, responds immediately to
any data message that it receives while in the QUERY state. It does not need to
cycle back through the State Machine before a response is sent back to the server
application unless the response requires a new position fix.
The TrimTrac 1.5, however, will not respond to data messages:
1. that are invalid (i.e. incorrect format, checksum, Unit ID, Security
Password and, if used, SIM PIN), or